Flexible lister-harrow



W. H.-F|SCH.

FLEXIBLE LISTER NARROW.

APPLICATION FILED nc. 26. |918.

'Patented Dec'. 7, 1920..

2 SHEETS-SHEET lf NW2 nvenor,

- .ttorny W. H. FISCH.

FLEXIBLE LISTER HARROW.

APPLlc/mon man nc.26. 191e.

1,361,037.. t Patented Dec. 7, 1920.

I 2 SHEETS-SHEET 2.

WILLAM n. risen, Yor orrs, COLORADO.

FLEXIBLE LIsTER-Hnnnow.

Specification of Letters Patenty Patented Dec. '7, 1920.

Application liled December 26, 1918. Serial No. 268,412.

To all whom t maja/ concern Be it known that I, WILLLAM H. FrscI-I, a citizen of the United States of America, residing at Otis, in the county of `Washing ton and State of Colorado, have invented certain new and useful Improvements in Flexible Lister-Harrows, of `which the following is a specification.v

This invention relates to lister harrows and one of its prime objects is to 4provide a highly flexible device of this nature constructed in such manner that the teeth thereof may be easily and quickly adjusted to any desired angle and in which each of the harrow elements comprises a plurality of flexibly connected sections any one of which is adapted to yield vertically when large rocks or other obstructions are encountered.

Further objects and advantages of the invention will be set forth in the detailed description which now follows.

In the accompanying drawings:

Figure 1 is a plan view of a flexible lister harrow constructed in accordance with the` invention;

Fig. 2 is a side elevation thereof;

Fig. 3 is a sectional view upon line 3--3 of Fig. 1;

Fig. 4 is a detail view illustrating the manner of mounting the teeth and Fig. 5 is a sectional view upon line 5-5 of Fig. 4.

Like numerals designate corresponding parts in all of the figures of the drawings.

Referring to the drawings and particularly to Fig. 1 it will be seen that the harrow constituting the present invention comprises a transverse bar 5 having suitable draft devices 6 attached thereto, said bar being common to a plurality of harrow elements which in the present case have been indicated as being three in number though it is to be understood that the number of these elements may be varied at will.

`Each of these elements comprises a plurality of sections 7 8 and 9 that are connected to the transverse bar 5 by bars 10, straps 11 and bolts 12 and 13. The bolts 13 traverse the bars 10 and flat straps 14, the upturned ends 15 of which are secured to side bars 16. These side bars 16 of section 7 are pivotally connected to side bars 17 of section 8 by means of tooth carrying pipes 18 and the side bars 17 are in turn pivotally connected to the side bars 19 of section 9 through the medium of a tooth carrying front ends thereof. The bars 16 are further united by braces 23- and if desired .corresponding braces may be employed in ffconjunction with the bars 17 and 19. Each of the tooth carrying pipe sections 22, 18, 20 and 21 carries an upstanding crank arm numbered respectively 24, 25, 26 and 27. The upper ends of the crank arms 24 andV 27 are connected by a bar 28. The upper ends of the crank arms 25 are connected by links 29 and pivots 30 with the bars 28. The upper ends of the' crank arms 26 are connected by links 31 with the upper ends of the crank arms 27. Braces 32 are pivoted at 33 to the 'crank arms 27 andare adapted to be connected by pins 34 and openings 35 at any one of a plurality of points upon the bars 28. By adjusting this point of attachment the angle of all of the teeth may be simultaneously and uniformly varied while, at the same time, the pivotal connections provided between the sections 7, 8

and 9 render it possible for any individual sections to yield vertically when obstructions are encountered by the teeth 36 thereof, as indicated in Fig. 2. As is best illustrated in Figs. 4 and 5 these teeth 36 are shaped to partially embrace the pipe section andare provided with reduced threaded stems 37 which are engaged by nuts 38 at the upper faces of these pipe sections. pipe 39 is secured by bolts'40 to the rear face of the bar 5 and this pipe section lcarries a plurality of teeth 41 which correspond tothe teeth 36.

While the elements shown and described are well adapted to serve the purposes for which they are intended it lis to be understood that the invention is rnot limited to the precise construction set forth but that it includes within its purview whatever changes fairly come within the spirit of the appended claim.

Having described my invention, what I claim is:

In a harrow a plurality of harrow elcments each comprising a plurality of transversely extending tooth carrying members, a plurality of pairs of side bars the adjacent ends of which are pivotally connected to the tooth carrying members to permit said members to have Vertical movement relatively to each other, a crank upon each tooth carrying member, a plurality of links establishing Connection between one of said cranks and each of the other cranks with-V out intermediate connection to any other crank, and a rigid brace extending between Y one of the cranks and one of said links to hold all of the tooth carrying members in adjusted position. I

In testimony whereof aiiX my signag ture in the presence of two witnesses.

VILLIAM H. FISCH.

Witnesses:

HARRY C. STEPHENS, M. L. STEPHENS. 

